Rotary pump and the like



p 1930- M. G. ROSENTHAL 1,776,452

ROTARY PUMP AND THE LIKE Filed Sept. 19, 1928 Patented Sept. '23, 1930MAX G. ROSENTHAL, OF CHICAGO, ILLINOIS ROTARY PUMP AND THE LIKEApplication filed September 19, 1928. Serial No. 306,793.

This invention relates to that type of rotary motors, pumps, meters andthe like, in which the rotor member carries a series of sliding pistonblades, adapted for sliding con- 8 tact with the inner face of theeccentrlcally disposed chamber of the stator member of the appliance, anexample of which is shown in my prior Patent No. 1,569,306, datedJanuary 12, 1926, and this improvement has for its ob- 10 ject.

To provide a structural formation and combination of parts in the abovementioned type of rotary apparatus, by means of whlch a durable andefiicient fluid tight joint is maintained between the contact ends ofthe radial piston blades of the rotor member in their eccentric travelaround and in contact with the closed here or chamber of the statormember, all as will hereinafter more fully appear.

In the accompanying drawing Fig. l, is a transverse section of a rotarypumpor the like apparatus embodying the preferred form of the invention.I Fig. 2, is a fragmentary horizontal sectlon of same, on line 22Fig. 1. Fig. 3, is a fragmentary sectional elevatlon of the centralportion of a pump or like apparatus illustrating a modified constructionof parts.

Like reference numerals indicate like parts in the different views.

In the construction shown, the stator member 1 is of any usual form,having central piston chamber, approximately circular in cross sectionfor the greater portion of its extent, with such portion merged into asegmental portion of less extent and in which the rotor member hasbearing.

In addition said stator member is formed with passages 2 and 3, for theinlet and outlet of fluid to and from its piston chamber, and is alsoprovided with closure heads 4, for the respective ends of such pistonchamber.

The rotor member 5, of the usual cylindrical form, is arrangedeccentrically in the piston chamber of the stator member 1, and in closecontact with the above described segmental portion of said pistonchamber. In addition the rotor member is formed with a plurality ofsubstantially radial recesses 6, for the reception and movement of thepiston members of the s tructure. The construction-so far described incommon to the present class of rotary pumps and the like, and is fullydisclosed in 1,569,306.

my aforesaid Patent No.

The novel and material feature of this improvement involvesa specificformation of the outer and bearing en a structure such as means of whicha cl contact between the blades and the inner ton chamber of the tainedin a simple and such end the inventi on involves broadly, the

formation of the outer end of each piston blade by a pluralityassociated together in and slidingly arranged an aforesaid radial r ofthin plates 7, loosely side by side relation, in the outer portion ofecess 6 of the rotor member 5 and having a length equal to that of saidrotor member.

Each plurality of scribed are capable thin plates 7 above deofindependent sliding movement, one upon the other, in order that theirouter ends may move to and maintain close contact with curved surface ofthe piston chamber of stator member, in the eccentric relation of saidpiston chamber to the rotor member and th thereby. plurality face ofwhich has a c e piston blades carried To such end the inner ends of eachof thin plates 7 will have support or abutment on a rocke r member 8,the bearing urvature of a radius substantially the same as the circularinner wall of the piston chamber.

The rocker member 8 is in turn pivotally mounted on a spring 9, thetendency of which is to move the rocker member outwardly and maintainthe plurality of thin plates 7 in close operative contact with the innerface of the piston chamber;

the rocker member 8, being adapted to have a rocking movement on thespring 9, to permit of an independe tween the plurality maintain therequired f sliding movement be- 0 thin plates 7 as they continuedcontact of their outer ends with the curved surface of the pistonchamber,

under the stress of the s ring 9. For heavy duty, the plurality of ed tocontain said plurality of plates and p ates 7, associated rocker 8 andspring 9 rocker member.

are preferably arranged in a holder 10 of a In testimony whereof Ihereunto ailix my channel shape in cross section, moving in a signature.radial recess 6 of the rotor member, with each 1 MAX G. ROSENTHAL.holder 10 provided with track rollers 11 at their respective ends forengagement in cam grooves 12 in the end heads 4 of the stator member.

The aforesaid cam grooves 11 will have a shape corresponding to theshape of the inner curved surface of piston chamber of the stator member1, as set forth in my prior Patent No.

1,569,306, above referred to. p 15 For light duty the entire slidingmovement of the plurality of thin lates 7 and their supporting rocker 8,may e effected wholly by the spring 9 upon which said rocker isplvotally mounted. In such construction, each I rocker 8 will bepivotally mounted on a slid- I ing plug 13 with a single spring 9interposed between the ends of a diametricall opposed pair of the plugs13 associated roc ers 8 and pluralities of plates 7 as illustrated inFig. 3. 25 I claim as my invention:

1. In a rotary pum or motor of the radially moving'type 0 piston, thecombination of a stator having a circular piston chamber, a rotor havinga recess extending its en- 30 tire length, a piston blade associatedwith said recess and comprising a plurality of thin plates in closeslidlng contact one with the other, and a rocker memberforming a commonbearing for the inner ends of said plates, 35 the bearing face of saidrocker member having a curvature the same as the curvature of the innerwall of the piston chamber of the stator.

2. In a rotary pump ormotor of the ral4o dially moving piston type, thecombination of a stator having a circular piston chamber, a rotor havinga recess extending its entire length, a piston blade associated withsaid recess and comprising a plurality of thin 45 plates in closesliding contact one with the no other, a rocker member forming a commonbearing for the inner ends of said plates, the bearing face of saidrocker member having a curvature the same as the curvature for the 50inner wall of the piston chamber of the stator,

and a spring forming'a yielding abutment for said rocker member.

3. In a rotary pump or motor of the radially moving piston type, thecombination of a 5 stator having a circular piston chamber, a

rotor having a recess extending its entire length, a piston bladeassociated with said recess and comprising a plurality of thin plates inclose sliding contact one with the other, a rocker member forming acommon bearing for the inner ends of said plates, the bearing face ofsaid rocker member having a curvature the same as the curvature of theinner walls of the piston chamber of the stano 65 tor, and a holder of achannel form and adapt- I

